Ionization and Fragmentation of Some Molecules by High-Energy Electrons

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Abstract
The mass spectra of some 10 representative organic compounds were obtained by using electrons with an energy up to 12 kev. Modifications of the ion source were made to reduce field penetration by the filament potential and emission of secondary electrons in the ion box. The mass spectra showed some small changes from 50 to 1000 ev. The changes were due to decreases in the abundance of ions of low relative intensity. These were ions which could be produced only by a succession of fragmentation processes. The mass spectra remained remarkably constant with further increase of the voltage. The significance of the results for gas phase radiolysis by α particles and β rays is briefly considered.